Retaining clamp



FIG. 1 is a front, left and top perspective view of an retaining clamp, showing my design.

FIG. 2 is a rear, right and bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict portions of the retaining clamp that form no part of the claimed design. 

CLAIM The ornamental design for an retaining clamp, as shown and described. 